Why do power stations use step-up transformers before sending AC electricity through transmission lines?

Power stations use step-up transformers before sending alternating current through transmission lines to increase the voltage to levels significantly higher than those produced by the electric generator itself.1

This process is essential for long-distance transmission because it minimizes power losses caused by the electrical resistance of the transmission lines. By raising the voltage, the current required to deliver the same amount of power is reduced, which directly decreases the energy lost as heat during transit. Once the electricity reaches its destination, substations use additional transformers to step down the voltage to levels that are safe and suitable for consumer distribution.12